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A generic file system module to implement the FAT file system for small embedded systems. The "Tiny" mode with FAT16 takes about 6K of flash and about 1K of RAM (not including user read/write buffers).
http://elm-chan.org/fsw/ff/00index_e.html

http://elm-chan.org/docs/mmc/mmc_e.html

The Sandisk secure Digital Card Product Manual version 1.9
http://www.cs.ucr.edu/~amitra/sdcard/ProdManualSDCardv1.9.pdf

Some discussions about SPI and SD memory card on Freescale 16-bit forum:
http://forums.freescale.com/freescale/board/message?board.id=16BITCOMM&thread.id=5370

http://freescalemcu.com/samples/SdDrivers.zip

http://freescalemcu.com/samples/Simplified_Physical_Layer_Spec.pdf

You may find some useful information from the following web sites:

http://www.freelabs.com/~whitis/sd_card/

http://www.inmotiondesign.ca/

http://www.flashgenie.net/

You also can do a Google search with the following words: 

hcs12 spi sd card forum